2005 taxonomy This taxonomy, as accepted by Bouchet & Rocroi, was based on the study by Nordsieck, published in 1986, and the classification as formulated by Schileyko in 1999. However Bouchet & Rocroi diverged from this classification in uniting the families Bulimulidae and Orthalacidae. They also considered the family Placostylidae as a distinct family from Orthalicidae, and the family Coelociontidae a distinct family from Urocoptidae. However, the position of the families Megaspiridae and Grangerellidae is doubtful. The following seven
families have been recognized in
the taxonomy of Bouchet & Rocroi (2005): • Family
Cerionidae Pilsbry, 1901 • Family
Coelociontidae Iredale, 1937 • † Family
Grangerellidae Russell, 1931 • Family
Megaspiridae Pilsbry, 1904 • Family
Orthalicidae Albers, 1860 • Family
Placostylidae Pilsbry, 1946 • Family
Urocoptidae Pilsbry, 1898 (1868) • Vidaliellidae H. Nordsieck, 1986 †
2008 taxonomy Uit de Weerd moved two families
Urocoptidae and
Cerionidae to newly established superfamily
Urocoptoidea based on
molecular phylogeny research in 2008.
2009 taxonomy Family
Prestonellidae van Bruggen, 1978 - A study by Herbert and Mitchell, published in 2009, places this enigmatic family, of which the phylogenetic relationships were previously unknown, in the
Gondwanan superfamily Orthalicoidea, while it was previously tentatively placed as a synonym of
Aillyidae.
2012 taxonomy Breure & Romero (2012) Therefore, there are recognized seven extant families and one extinct family within Orthalicoidea: •
Amphibulimidae P. Fischer, 1873 •
Bothriembryontidae Iredale, 1937 •
Bulimulidae Tryon, 1867 • †
Grangerellidae Russell, 1931 •
Megaspiridae Pilsbry, 1904 •
Odontostomidae Pilsbry & Vanatta, 1898 •
Orthalicidae Albers, 1860 •
Simpulopsidae Schileyko, 1999 • †
Vidaliellidae H. Nordsieck, 1986 ==References==